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Combination(nCr). Permutation & Combination Calculator is an online statistics tool programmed to calculate the nPr-Permutation and nCr-Combination of the n different items or symbols. The factorial is involved to perform both the ncr and npr calculations for a given N and R sample points of a data set.
You've already chosen the best response. Well, if nCr=91=7*13, then we know that n=7,13,91. If it's 91, there are two options. If n=7, then we won't ever get a 13 in the numerator, so there are no possibilities there. If n=13, there's only one factor of 7 in \(13!\) (there would be more if we had \(14!\)). And no matter what we divide by, there's always a 7 in the denominator. so there are no possibilities here either. KingGeorge. 1  2 years ago.